261524261 has 2 divisors, whose sum is σ = 261524262. Its totient is φ = 261524260.

The previous prime is 261524257. The next prime is 261524279. The reversal of 261524261 is 162425162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154008100 + 107516161 = 12410^2 + 10369^2 .

It is a cyclic number.

It is not a de Polignac number, because 261524261 - 2² = 261524257 is a prime.

It is a super-2 number, since 2×261524261² = 136789878183192242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261524761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130762130 + 130762131.

It is an arithmetic number, because the mean of its divisors is an integer number (130762131).

Almost surely, 2^261524261 is an apocalyptic number.

It is an amenable number.

261524261 is a deficient number, since it is larger than the sum of its proper divisors (1).

261524261 is an equidigital number, since it uses as much as digits as its factorization.

261524261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 29.

The square root of 261524261 is about 16171.7117523161. The cubic root of 261524261 is about 639.4952571445.

Subtracting from 261524261 its reverse (162425162), we obtain a palindrome (99099099).

The spelling of 261524261 in words is "two hundred sixty-one million, five hundred twenty-four thousand, two hundred sixty-one".